Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 4: Topological insulators and spin-dependent transport phenomena

MA 4.5: Vortrag

Montag, 1. April 2019, 10:30–10:45, H52

Transport and scanning tunneling microscopy study on layered Dirac material EuMnBi2 — •Xinglu Que1,2, Qingyu He1,2, Claus Mühle1, Jürgen Nuss1, Lihui Zhou1, and Hidenori Takagi1,2,31Max Planck Institute for Solid State Research, Stuttgart, Germany — 2Institute for Functional Matter and Quantum Technologies, University of Stuttgart, Germany — 3Department of Physics, University of Tokyo, Japan

The interplay of correlation and topology could give rise to novel properties. In this presentation we report our investigation of a layered magnetic Dirac material EuMnBi2, by using transport and STM. EuMnBi2 exhibits rich magnetic textures, by controlling which distinct electronic structures are accessible. Antiferromagnetically ordered Eu ions decouple the Bi layers which host Dirac fermions, leading to the emergence of multilayer Quantum Hall effect as revealed by our transport data. The application of an external magnetic field drives the material into different states. The STM reveals well defined steps after low temperature cleavage. Local spectroscopy finds features derived from Bi, in good agreement with band structure calculations.

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